2Sii 



ADDENDA, VOL. H. 



la. CLAIUAS NGAMENSIS. 



Casteln. Mem. Poiss. Afr. Austr. p. 63 (1861) ; Boiileng. Tr. ZdoI. Soc. xviii. I'Jll, 

 p. 404, pi. .x.xxviii. fig. 2 ; Gilchr. & Thomps. Ann. S. Afr. Mus. xi. 1913, 

 ji. 443. 



Depth of l»()(ly fi^ times in total lengtli, length of head 3 times. 

 Head ]| times as long as broad, smootli above (young); occipital 

 process angular; frontal fontanelle f length of head; occipital fontanelle 

 small, in advance of occipital process ; eye 3 times in length of snout, 

 5 times in interorbital widtli, which equals width of mouth and § length 



rig. 173. 



Chirias ngamensis. 

 OkovangoE. (Tr. Z. S. ]911). 



of head ; band of prremaxillary teeth 4 times as long as broad ; vomerine 

 teeth granular, forming a crescentic bau<l which, in the middle, is 

 nearly twice as broad as the priEmaxillary band; anteri(U" mandibular 

 teeth pointed, posterior granular. Nasal barbel \ length of Iiead, 

 maxillary f, reaching middle of pectoral spine, outer mandibular j, 

 inner nuuidibular h- Oill-rakers long, about 30 on anterior arch. 

 Clavicles striated, distinct under the thin skin. Dorsal 60, its distance 

 from occipital process i length of head, its distance from caudal 

 fin ^. Anal 50, narrowly separated from caudal. Pectoral not quite 

 ^ length of head, its spine serrated on the outer border and | the 

 length of the fin. A'entral equally distant from end of snout and 



